CN102044233A - Control method of display brightness and display device thereof - Google Patents
Control method of display brightness and display device thereof Download PDFInfo
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- CN102044233A CN102044233A CN2009102062213A CN200910206221A CN102044233A CN 102044233 A CN102044233 A CN 102044233A CN 2009102062213 A CN2009102062213 A CN 2009102062213A CN 200910206221 A CN200910206221 A CN 200910206221A CN 102044233 A CN102044233 A CN 102044233A
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Abstract
The invention discloses a control method of display brightness and a display device thereof. The method comprises the steps: analyzing the low-brightness pixel ratio of image data, wherein the low-brightness pixel ratio is defined to be the ratio of the number of the pixels of which the brightness value is lower than a preset brightness value to the whole pixel number of the image data; analyzing the highest brightness value and the lowest brightness value of the image data, and controlling a backlight module of a display device according to the low-brightness pixel ratio, the highest brightness value and the lowest brightness value to adjust the brightness which corresponds to the backlight module; defining a plurality of luminous levels of the backlight module; and dynamically selecting one level from the defined levels to implement according to the data.
Description
Technical field
The present invention relates to a kind of method for controlling display brightness and display device, relate in particular to low-light level pixel ratio and the highest grade, minimum brightness, control the method for controlling display brightness and the display device of display backlight brightness by judging image data.
Background technology
In the prior art, the user usually carries out the adjustment of parameter values such as brightness or contrast by the OSD software that is arranged in the display device, make that the user can be under the parameter value that is fit to, observe static text, photo or image data, yet above-mentioned action need be by user's manual adjustment voluntarily.
Generally speaking, different static texts, photo or image data will corresponding different parameter values, yet in fact the user can not be when static text, photo or image data change, and manual adjustment is pairing suitable parameters one by one.Particularly, all the more so for image data.So need and a kind ofly can detect the image state automatically, and corresponding method that produces the suitable parameters value.
Summary of the invention
Because above-mentioned prior art problems, the object of the present invention is to provide a kind of method for controlling display brightness and display device, can dynamically adjust backlight illumination effectively, make that color level, contrast and the image detail of image data can better be shown.
According to purpose of the present invention, a kind of method for controlling display brightness is proposed, it comprises the following step.The a plurality of luminous grade of the backlight module of definition display device, use the low-light level pixel ratio of the processing module analysis image data of display device, this low-light level pixel ratio is the ratio that brightness value is lower than number of pixels with whole number of pixels of image data of default low brightness values, then uses the highest brightness value and the minimum brightness value of the processing module analysis image data of display device.At last, the processing module of using display device is selected one according to low-light level pixel ratio, highest brightness value and minimum brightness value from a plurality of luminous grades, and the control backlight module comes luminous with selected luminous grade.
Wherein, the step of described selection more comprises: judge described low-light level pixel ratio at high proportion, middle ratio or low ratio.
Preferably, described a plurality of luminous grade comprises the highest luminous grade, higher luminous grade, low luminous grade and minimum luminous grade.
When described low-light level pixel ratio at high proportion the time, select one from described higher luminous grade, described low luminous grade and described minimum luminous grade.
When described low-light level pixel ratio is middle ratio, select one from described higher luminous grade and described low luminous grade.
When described low-light level pixel ratio is when hanging down ratio, select one from the highest described luminous grade and described higher luminous grade.
According to purpose of the present invention, a kind of display device is proposed, it comprises data input/output port, display panel, backlight module and processing module.The data input/output port receives image data, and backlight module in order to luminous to display panel.Processing module is in order to process image data, and the image data crossed of control display panel display process, and processing module analyzes the low-light level pixel ratio of image data, and highest brightness value and the minimum brightness value of analyzing image data.The processing module of using display device is selected one according to low-light level pixel ratio, highest brightness value and minimum brightness value from a plurality of luminous grades, and the control backlight module comes luminous with selected luminous grade.Wherein low-light level pixel ratio is that brightness value is lower than the ratio of whole number of pixels of the number of pixels of default low brightness values and image data.
From the above, according to method for controlling display brightness of the present invention and display device, can have following one or more advantages:
(1) this method for controlling display brightness defines at least four kinds of intervals again in the contrast management (ACM:Acer Adaptive Contrast Management) that is fit to, in order to the color level and the image detail of further lifting image.
(2) this method for controlling display brightness comprises extra small brightness again under minimum brightness, is specially adapted to be higher than 10000: 1 contrast environment.
(3) the present invention is in 256 GTG values of 0-255, selects for use GTG value 32 as the condition of judging, this GTG value be can by human eye the brightness of identification easily, and can reduce the operand of operating this brightness.
Description of drawings
Fig. 1 is the process flow diagram of first embodiment of method for controlling display brightness of the present invention;
Fig. 2 is the synoptic diagram of first embodiment of method for controlling display brightness of the present invention;
Fig. 3 is the process flow diagram of second embodiment of method for controlling display brightness of the present invention; And
Fig. 4 is the process flow diagram of the 3rd embodiment of method for controlling display brightness of the present invention.
Embodiment
See also Fig. 1 and Fig. 2, it is respectively process flow diagram and the synoptic diagram of first embodiment of method for controlling display brightness of the present invention.Among the figure, method for controlling display brightness comprises the following step.At step S101, a plurality of luminous grade of the backlight module of definition display device.Then analyze the low-light level pixel ratio of image data at step S102.The low-light level pixel ratio is the ratio that brightness value is lower than whole number of pixels of the number of pixels of default low brightness values and image data.Please consult Fig. 2 simultaneously, among the figure with GTG value 32 as default low brightness values, and the GTG value of all pixels of statistics image data, it is lower than 32 ratio what.The low-light level pixel ratio is divided at high proportion in Fig. 2, three sections such as middle ratio or low ratio consider, the I district, and the GTG value is lower than the ratio that 32 pixel accounts for whole image and surpasses 90%, and it represents that at high proportion this image is inclined to one side shadow picture; In the II district, the GTG value is lower than ratio that 32 pixel accounts for whole image between 80% and 90%, and it is middle ratio, represents that this image is general brightness image; In the III district, the GTG value is lower than the ratio that 32 pixel accounts for whole image and is lower than 80%, and it represents that for low ratio this image is bright partially image.Use the processing module of display device to analyze the highest brightness value and the minimum brightness value of image data at step S103.At last, the processing module of using display device is selected one according to low-light level pixel ratio, highest brightness value and minimum brightness value from a plurality of luminous grades, and the control backlight module comes luminous with selected luminous grade.In this embodiment, be brightness value to be divided into 256 GTG values with 0-255 represent, but GTG quantity of the present invention is not as limit.
Wherein, when image data is during near complete dark brightness, carry out minimum brightness, that is the control backlight module is in minimum luminous grade; When image data is normal brightness, carry out typical high brightness, that is the control backlight module is in higher luminous grade; When image data is the standard darkness, carry out typical low-light level, that is the control backlight module is in low luminous grade; When image data is when the full brightness, carry out high-high brightness, that is the control backlight module is in the highest luminous grade.In the enforcement, the brightness value of higher luminous grade be preferably the highest luminous grade brightness value 70%～90%, and the brightness value of low luminous grade be preferably the highest luminous grade brightness value 20%～30%.
The condition of carrying out which kind of state is respectively with the foundation of GTG value bright and the darkest in low-light level pixel ratio and the picture as judgement.Its division is as follows:
The low-light level pixel ratio of image data is more than or equal to 0.9 and smaller or equal to 1, and the brightest GTG value was selected minimum luminous grade smaller or equal to 4 o'clock in the picture.
The low-light level pixel ratio of image data is between 0.9～1, and the brightest GTG value was selected higher luminous grade greater than 220 o'clock in the picture.
The low-light level pixel ratio of image data and when the brightest GTG value is between 5～220 in the picture, is selected low luminous grade between 0.9～1.
The low-light level pixel ratio of image data is between 0.8～0.9, and the brightest GTG value was selected higher luminous grade greater than 220 o'clock in the picture.
The low-light level pixel ratio of image data is between 0.8～0.9, and the brightest GTG value was selected low luminous grade smaller or equal to 220 o'clock in the picture.
The low-light level pixel ratio of image data is smaller or equal to 0.8 and more than or equal to 0 o'clock, and the darkest GTG value was selected the highest luminous grade greater than 252 o'clock in the picture.
The low-light level pixel ratio of image data is smaller or equal to 0.8 and more than or equal to 0 o'clock, and the darkest GTG value was selected higher luminous grade smaller or equal to 252 o'clock in the picture.
With reference to the synoptic diagram of figure 2, transverse axis is represented its low-light level pixel ratio, and the longitudinal axis is represented its pairing brightness.For example, in area I, the condition of judgement is for when the low-light level pixel ratio is between 90%～100%, if minimum brightness is carried out in the brightest GTG value≤4 in the picture; If typical high brightness is carried out in the brightest GTG value＞220 in the picture; If typical low-light level is carried out in the brightest GTG value≤220 in 4＜picture.At area I I, the condition of judgement is for when the low-light level pixel ratio is between 80%～90%, if typical high brightness is carried out in the brightest GTG value＞220 in the picture; If typical low-light level is carried out in the brightest GTG value≤220 o'clock in the picture.At area I II, the condition of judgement is for when the low-light level pixel ratio is between 0%～80%, if high-high brightness is carried out in the darkest GTG value＞252 in the picture; If typical high brightness is carried out in the darkest GTG value≤252 in the picture.In addition, the default value that high-high brightness can be panel when dispatching from the factory, and minimum brightness can be adjusted by utilizing the pulse width modulation (PWM) or the mode of software.Preferably, typical high brightness is 90% of a high-high brightness, and typical low-light level is 25% of a high-high brightness.Yet actually, typical high brightness can allow in 70%～90% of high-high brightness, and typical low-light level can allow in 20～30% of high-high brightness.
It should be noted that, image data might change at any time, so need between the brightness of various definition, change, the time of its conversion, except being converted to minimum brightness, high-high brightness roughly needs switching time of twice and minimum brightness to be converted to high-high brightness roughly to need the switching time of twice, conversion between all the other each brightness only needs one times switching time, this switching time in about haply 8 seconds.It is respectively, and high-high brightness is converted to typical high brightness and typical low-light level roughly needs one times switching time; Typical case's high brightness is converted to high-high brightness, typical low-light level and minimum brightness roughly needs one times switching time; Typical case's low-light level is converted to high-high brightness, typical high brightness and minimum brightness roughly needs one times switching time; Minimum brightness is converted to typical high brightness and typical low-light level roughly needs one times switching time.
See also Fig. 3, it is the process flow diagram of second embodiment of method for controlling display brightness of the present invention.In the present embodiment, method for controlling display brightness comprises the following step: start the high-contrast adjustment of image data at step S202; High-contrast then then enters step S204 after adjusting (contrast is higher than 10000: 1) startup, carries out status detection, and whether the differentiation state is minimum brightness; If not minimum brightness, the then detection of return state; Otherwise, if minimum brightness then enters step S208, judge whether the state of minimum brightness continues 5 minutes, if do not continue 5 minutes, then continue as minimum brightness; Otherwise,, then enter the extra small luminance state of step S210 if continue 5 minutes minimum brightnesses; Then enter step S212, judge whether the state of extra small brightness continues 5 minutes,, then continue as extra small brightness if do not continue 5 minutes; Otherwise,, then enter the minimum brightness state of step S214 if continue extra small brightness in 5 minutes.
See also Fig. 4, it is the process flow diagram of the 3rd embodiment of method for controlling display brightness of the present invention.In the present embodiment, method for controlling display brightness comprises the following step: start the high-contrast adjustment of image data at step S302; Then enter step S304, carry out status detection, that is detect whether enter minimum brightness, typical low-light level, typical high brightness, high-high brightness or extra small brightness; Then enter step S306, according to the result of detected state, the state that judges whether to carry out changes, and changes if will carry out state, then enters step S308, carries out changing between the state of 8 seconds or 16 seconds, and after the conversion, turns back to step S304 again; Otherwise, then directly turn back to the state-detection of step S304; If the user starts the setting that brightness is adjusted, then interrupt above-mentioned steps, enter step S310, and enter step S312 simultaneously, close the high-contrast adjustment of image data; If the user starts the high-contrast adjustment of image data once more, then enter step S302 once more.
In addition, in another embodiment, utilize said method, be implemented in the test result of different images data pattern:
If image data is complete black pattern (all pixel gray level is 0), then the high-contrast adjustment enters minimum brightness.
If image data is complete white pattern (all pixel gray level is 255), then the high-contrast adjustment enters high-high brightness.
If image data is a low-light level pixel ratio between 0.9 and 1 time, and when the maximum pixel GTG smaller or equal to 4 the time, then the high-contrast adjustment enters minimum brightness.
If image data is a low-light level pixel ratio between 0.9 and 1 time, and when the maximum pixel GTG was between 5～220, then the high-contrast adjustment entered typical low-light level.
If image data is a low-light level pixel ratio between 0.9 and 1 time, and when the maximum pixel GTG greater than 220 the time, then the high-contrast adjustment enters typical high brightness.
If image data is a low-light level pixel ratio between 0.8 and 0.9 (not comprising 0.9) time, and when the maximum pixel GTG greater than 220 the time, then the high-contrast adjustment enters typical high brightness.
If image data is a low-light level pixel ratio between 0.8 and 0.9 (not comprising 0.9) time, and when the maximum pixel GTG smaller or equal to 220 the time, then the high-contrast adjustment enters typical low-light level.
If image data is a low-light level pixel ratio between 0.7 and 0.8 (not comprising 0.8) time, and when the maximum pixel GTG greater than 220 the time, then the high-contrast adjustment enters typical high brightness.
If image data is a low-light level pixel ratio between 0.6 and 0.7 (not comprising 0.7) time, and when the maximum pixel GTG greater than 220 the time, then the high-contrast adjustment enters typical high brightness.
If image data is a low-light level pixel ratio between 0.5 and 0.6 (not comprising 0.6) time, and when the maximum pixel GTG greater than 220 the time, then the high-contrast adjustment enters typical high brightness.
If image data is a low-light level pixel ratio between 0.4 and 0.5 (not comprising 0.5) time, and when the maximum pixel GTG greater than 220 the time, then the high-contrast adjustment enters typical high brightness.
If image data is a low-light level pixel ratio between 0.3 and 0.4 (not comprising 0.4) time, and when the maximum pixel GTG greater than 220 the time, then the high-contrast adjustment enters typical high brightness.
If image data is a low-light level pixel ratio between 0.2 and 0.3 (not comprising 0.3) time, and when the maximum pixel GTG greater than 220 the time, then the high-contrast adjustment enters typical high brightness.
If image data is a low-light level pixel ratio between 0.1 and 0.2 (not comprising 0.2) time, and when the maximum pixel GTG greater than 220 the time, then the high-contrast adjustment enters typical high brightness.
If image data is a low-light level pixel ratio between 0 and 0.1 (not comprising 0.1) time, and when the maximum pixel GTG greater than 252 the time, then the high-contrast adjustment enters high-high brightness.
As if being when having the black background of some white text when image data, then the high-contrast adjustment enters typical high brightness.
As if being when having the black background of more white text when image data, then the high-contrast adjustment enters typical high brightness.
As if being when having the black background of a lot of white text when image data, then the high-contrast adjustment enters typical high brightness.
As if being when having the white background of some black literal when image data, then the high-contrast adjustment enters typical high brightness.
Moreover, further test again;
Test condition is that system entered minimum brightness after 5 minutes, and then the high-contrast adjustment enters extra small brightness.
Test condition is that system entered minimum brightness after 10 minutes, and then the high-contrast adjustment enters minimum brightness.
The above only is an illustrative, but not is restricted person.Control luminescence unit or the mode of adjusting display parameter can be used separately or be used in combination, and so anyly do not break away from spirit of the present invention and category, and to its equivalent modifications of carrying out or change, all should be contained in the scope of the application's claim.
Claims (7)
1. method for controlling display brightness comprises following steps:
The a plurality of luminous grade of the backlight module of definition display device;
Use the processing module of described display device to analyze the low-light level pixel ratio of image data, described low-light level pixel ratio is the ratio that brightness value is lower than whole number of pixels of the number of pixels of default low brightness values and described image data;
Use the described processing module of described display device to analyze the highest brightness value and the minimum brightness value of described image data; And
The described processing module of using described display device is selected one from described a plurality of luminous grades, and is controlled described backlight module and come luminous with selected luminous grade according to described low-light level pixel ratio, described highest brightness value and described minimum brightness value.
2. method for controlling display brightness as claimed in claim 1, the step of wherein said selection more comprises:
Judge described low-light level pixel ratio at high proportion, middle ratio or low ratio.
3. method for controlling display brightness as claimed in claim 2, wherein said a plurality of luminous grades comprise the highest luminous grade, higher luminous grade, low luminous grade and minimum luminous grade.
4. method for controlling display brightness as claimed in claim 3 more comprises:
When described low-light level pixel ratio at high proportion the time, select one from described higher luminous grade, described low luminous grade and described minimum luminous grade.
5. method for controlling display brightness as claimed in claim 3 more comprises:
When described low-light level pixel ratio is middle ratio, select one from described higher luminous grade and described low luminous grade.
6. method for controlling display brightness as claimed in claim 3 more comprises:
When described low-light level pixel ratio is when hanging down ratio, select one from the highest described luminous grade and described higher luminous grade.
7. display device comprises:
The data input/output port is in order to receive image data;
Display panel;
Backlight module is in order to luminous extremely described display panel; And
Processing module in order to handling described image data, and is controlled the image data that described display panel shows described processing, and according to as any described method for controlling display brightness in the claim 1 to 6, is controlled described backlight module.
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| CN2009102062213A CN102044233A (en) | 2009-10-16 | 2009-10-16 | Control method of display brightness and display device thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103617792A (en) * | 2013-11-14 | 2014-03-05 | 天津三星电子有限公司 | Method for adjusting image display of display terminal and display terminal |
| CN105261332A (en) * | 2015-11-10 | 2016-01-20 | 深圳市华星光电技术有限公司 | A method, system and apparatus for dynamic backlight local control liquid crystal display |
| CN109272970A (en) * | 2018-10-30 | 2019-01-25 | 维沃移动通信有限公司 | A kind of screen luminance adjustment method and mobile terminal |
| CN109858324A (en) * | 2018-12-10 | 2019-06-07 | 西南石油大学 | Language graphics context identifying system and its implementation |
-
2009
- 2009-10-16 CN CN2009102062213A patent/CN102044233A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103617792A (en) * | 2013-11-14 | 2014-03-05 | 天津三星电子有限公司 | Method for adjusting image display of display terminal and display terminal |
| CN103617792B (en) * | 2013-11-14 | 2015-09-09 | 天津三星电子有限公司 | A kind of regulate display terminal picture to show method and display terminal |
| CN105261332A (en) * | 2015-11-10 | 2016-01-20 | 深圳市华星光电技术有限公司 | A method, system and apparatus for dynamic backlight local control liquid crystal display |
| CN109272970A (en) * | 2018-10-30 | 2019-01-25 | 维沃移动通信有限公司 | A kind of screen luminance adjustment method and mobile terminal |
| CN109858324A (en) * | 2018-12-10 | 2019-06-07 | 西南石油大学 | Language graphics context identifying system and its implementation |
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Application publication date: 20110504 |